Question: A. Encrypt the message COME BACK using a multiplicative Caesar cipher modulo 27 with encrypting multiplier 16. Then find the decrypting multiplier. B. Suppose we

A. Encrypt the message COME BACK using a multiplicative Caesar cipher modulo 27 with encrypting multiplier 16.

Then find the decrypting multiplier.

B. Suppose we use a multiplicative Caesar cipher modulo 26 and use the encrypting multiplier 13. Which letters can occur in an encrypted message?

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